Tokyo police and immigration officials took more than 20 Chinese, Iranian and other foreigners in the Shinjuku area into custody Monday night on suspicion they have been overstaying their visas.

At around 8 p.m. more than 100 police and immigration officers blocked off four alleys in Shinjuku Ward’s Okubo area, a thriving cluster of ethnic restaurants, Asian goods shops and small hotels where many foreign workers reportedly live.

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